J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 NJ DEP 2-hr NJDEP Rainfall= 1.25" Prepared byTRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAO Software Solutions LLC Printed 3/14/2012 Page 66 Summary for Subcatchment 1: PO-DA 1 Runoff = 0.76 cfs@ 1.28 hrs, Volume= 0.036 af, Depth= 0.32" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" Area (sf) CN Description * 11,168 38,971 8,088 98 79 78 Impervious, HSG D Woods/grass comb., Good, HSG D Meadow, non-grazed, HSG D 58,227 47,059 11,168 83 79 98 Weighted Average 80.82% Pervious Area 19.18% Impervious Area Tc (min) Length (feet) 16.9 150 0.0270 0.15 1.3 270 0.0520 3.42 18.2 420 Total Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 1: PO-DA 1 Hydrograph ---- I -- j 0.76 cfs 0.750.65- m £ 0.6- 2 0.7 — i—lx —i — ---I---- l - 0.450.4- % 1 _I__J _ tl 0.350.3 0.250.2- - -i----- 1---- -- I---l 0.15t > i . l--s---- »_ l > I 0.1 0.05 01 234 567 _ L-- 1-- NJ DEP 2-hr NJDEP •r iii Rainfall=1.25' Runoff Area=58,227 sf Runoff Volume=0.036 af Runoff Depth=Q.32M Flow Length=420' i i i i i i i Tc=18.2 min CN=79/98 - t - "i - 0.55i 0.5- iiii .1----X _ J-------I----L I I -I-- -t - 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)